—radius /ˈreɪ.di.əs/
noun [C] (PLURAL radii) (DISTANCE)
F0 (the length of) a straight line joining the centre of a circle to its edge or the centre of a sphere to its surface:
» The radius of this wheel is 30 cm.» This wheel has a radius of 30 cm.Thesaurus+: ↑Parts of geometrical shapesF0 a distance:
» The station, shopping centre and school lie within a one-mile radius of the house.Thesaurus+: ↑Measurements in generalnoun [C] (PLURAL radii) SPECIALIZED (BONE)
► F0 the thicker of the two bones in the lower armSee picture: radius 
Thesaurus+: ↑The armThesaurus+: ↑Bone structures
- ♯ Parts of watercourses
- ♯ Passages and entrance areas
- ♯ Passenger, cargo and military ships
- ♯ Passing on illness and causing disease
- ♯ Passionate or passing interests
- ♯ Passive and not working
- ♯ Pasta
- ♯ Pastimes - general words
- ♯ Pastry and pies
- ♯ Patient and uncomplaining
- ♯ Patriotism and nationalism
- ♯ Patterns and shapes
- ♯ Pauses and interludes
- ♯ Paying and spending money
- ♯ Paying attention and being careful
- ♯ Peace
- ♯ Peaceful and tranquil
- ♯ Pedestrian routes
- ♯ People and character traits
- ♯ People appearing in court
- ♯ People having good qualities
- ♯ People held in prison
- ♯ People in charge of or controlling other people
- ♯ People in general
- ♯ People of little importance